Products Description
Product Specifications
| Standards | ASTM A213 / ASME SA213 |
| Steel Grades | Super 304H (UNS S30432) |
| Equivalent Grades | TP304H (upgrade), 1.4948 (EN), S30409 |
| Outer Diameter (OD) | 5mm-420mm |
| Wall Thickness (WT) | 0.5mm-55mm |
| Length | 6m/12m,or customized |
| Surface Treatment | Pickled |
| Production Process | Hot rolled / Cold drawn |
| Condition | Solution Annealed |
Super 304H Stainless Steel Pipe is manufactured using Super 304H material. Compared to ordinary stainless steel, 304H can withstand temperatures of 600–650°C and operate stably at steam pressures exceeding 22.1 MPa.
Super304H is an economical 18-8 austenitic heat-resistant stainless steel developed based on TP304H steel. By incorporating 3% Cu and 0.4% Nb, it achieves exceptionally high creep strength through the combined effects of a fine-grained structure and precipitation strengthening by fine copper phases.
Its corrosion resistance is superior to that of TP304H but slightly lower than that of TP347H, while its susceptibility to weld hot cracking is lower than that of TP347H. It is commonly used for superheater and reheater tubes where the flue gas-side wall temperature does not exceed 705°C.
Customized Services
- TORICH offers custom manufacturing for non-standard specifications, covering any outer diameter within the range of 5mm to 420mm and any wall thickness within the range of 0.5mm to 55mm.
- In accordance with client welding standards and drawing requirements, we precisely machine various bevel angles (including V-type, U-type, Double-V type, etc.). We also provide a comprehensive range of end-forming treatments, such as internal and external bevel grinding, chamfering, flaring, swaging, and curling.
- We offer a wide selection of material grades, including TP304H, TP309S, TP309H, TP310S, TP316, TP316L, TP317, TP321, TP347, TP347H, TP348, TP348H, TP444, and others.
Chemical Composition
| Element | C | Cr | Ni | N | Nb | Cu | B | Fe |
|---|---|---|---|---|---|---|---|---|
| Content (%) | 0.07–0.12 | 17.0–19.0 | 8.0–11.0 | 0.10–0.15 | 0.30–0.60 | 2.0–3.0 | 0.001–0.006 | Balance |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | Max Operating Temperature |
| Value | ≥ 620 | ≥ 315 | ≥ 35 | ≤ 190 | Up to 650°C |
Possible Alternative Grades
- TP347HFG (fine grain) exhibits better creep resistance than TP304H. It is used in high-temperature steam pipes and superheaters.
- TP310H maintains excellent oxidation resistance at temperatures up to 1050°C and can be used in furnace tubes and high-temperature heat exchangers.
- Compared to Super304H, HR3C (UNS S31042) has higher Cr and Nb content, resulting in superior creep rupture strength and oxidation resistance.
application areas
ASTM A213 Super 304H stainless steel tubes are widely utilized in the following fields:
- Ultra-Supercritical (USC) Power Plant Boilers: High-temperature section tube panels for uperheaters and reheaters.
- Advanced Ultra-Supercritical (A-USC) Units: Intermediate-to-high temperature section superheaters and reheaters.
- Heat Recovery Steam Generators (HRSG): High-temperature heat exchanger tube bundles within gas-steam combined cycle power generation units.
- Chemical and Petrochemical Industries: Heat exchanger tubes for high-temperature and high-pressure applications, such as high-temperature heat exchangers, cracking furnace tubes, and reforming furnace tubes.
- Waste-to-Energy Plants: Superheater and reheater tube bundles for incinerators.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the fundamental difference between Super 304H and standard 304H stainless steel tubing?
A: Super 304H is an improved variant of TP304H, featuring the addition of 3% copper (Cu) and 0.4% niobium (Nb). Thanks to its fine-grained structure and the precipitation strengthening effect of fine copper phases, it achieves exceptionally high creep strength; specifically, its allowable stress in the 600–650°C temperature range is 30% higher than that of TP304H.
Q: What precautions should be taken when welding Super 304H?
A: Super 304H exhibits excellent weldability. It is recommended to employ GTAW (Gas Tungsten Arc Welding) or SMAW (Shielded Metal Arc Welding) processes, utilizing matching welding consumables such as YT-304H or #T-304H.
Q: Compared to HR3C, why is Super 304H more highly recommended for use in the conventional high-temperature sections of ultra-supercritical boilers?
A: When comparing the two, Super 304H offers superior cost-effectiveness, with a material cost that is 20% to 30% lower than that of HR3C, in addition to providing better processing and welding performance. The advantages of HR3C become significantly more pronounced only under extremely high-temperature operating conditions (≥650°C).
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